<template>
    <div class="sc-upload" :class="{'sc-upload-round':round}" :style="style">
        <div v-if="file && file.status != 'success'" class="sc-upload__uploading">
            <div class="sc-upload__progress">
                <el-progress :percentage="file.percentage" :text-inside="true" :stroke-width="16"/>
            </div>
            <el-image class="image" :src="file.tempFile" fit="cover"></el-image>
        </div>
        <div v-if="file && file.status=='success'" class="sc-upload__img">
            <el-image class="image" :src="file.url" :preview-src-list="[file.url]" fit="cover" hide-on-click-modal append-to-body :z-index="9999">
                <template #placeholder>
                    <div class="sc-upload__img-slot">
                        Loading...
                    </div>
                </template>
            </el-image>
            <div class="sc-upload__img-actions" v-if="!disabled">
                <span class="del" @click="handleRemove()"><el-icon><el-icon-delete /></el-icon></span>
            </div>
        </div>
        <el-upload v-if="!file" class="uploader" ref="uploader"
            :auto-upload="cropper?false:autoUpload"
            :disabled="disabled"
            :show-file-list="showFileList"
            :action="action"
            :name="name"
            :data="data"
            :accept="accept"
            :limit="1"
            :http-request="request"
            :on-change="change"
            :before-upload="before"
            :on-success="success"
            :on-error="error"
            :on-exceed="handleExceed">
            <slot>
                <div class="el-upload--picture-card">
                    <div class="file-empty">
                        <el-icon><component :is="icon" /></el-icon>
                        <h4 v-if="title">{{title}}</h4>
                    </div>
                </div>
            </slot>
        </el-upload>
        <span style="display:none!important"><el-input v-model="value"></el-input></span>
        <el-dialog title="剪裁" draggable v-model="cropperDialogVisible" :width="580" @closed="cropperClosed" destroy-on-close>
            <sc-cropper :src="cropperFile.tempCropperFile" :compress="compress" :aspectRatio="aspectRatio" ref="cropper"></sc-cropper>
            <template #footer>
                <el-button @click="cropperDialogVisible=false" >取 消</el-button>
                <el-button type="primary" @click="cropperSave">确 定</el-button>
            </template>
        </el-dialog>
    </div>
</template>

<script>
    import { defineAsyncComponent } from 'vue'
    import { genFileId } from 'element-plus'
    const scCropper = defineAsyncComponent(() => import('@/components/scCropper'))
    import config from "@/config/upload"

    export default {
        props: {
            modelValue: { type: String, default: "" },
            height: {type: Number, default: 148},
            width: {type: Number, default: 148},
            title: { type: String, default: "" },
            icon: { type: String, default: "el-icon-plus" },
            action: { type: String, default: "" },
            apiObj: { type: Object, default: () => {} },
            name: { type: String, default: config.filename },
            data: { type: Object, default: () => {} },
            accept: { type: String, default: "image/gif, image/jpeg, image/png" },
            maxSize: { type: Number, default: config.maxSizeFile },
            limit: { type: Number, default: 1 },
            autoUpload: { type: Boolean, default: true },
            showFileList: { type: Boolean, default: false },
            disabled: { type: Boolean, default: false },
            round: { type: Boolean, default: false },
            onSuccess: { type: Function, default: () => { return true } },

            cropper: { type: Boolean, default: false },
            compress: {type: Number, default: 1},
            aspectRatio:  {type: Number, default: NaN}
        },
        components: {
            scCropper
        },
        data() {
            return {
                value: "",
                file: null,
                style: {
                    width: this.width + "px",
                    height: this.height + "px"
                },
                cropperDialogVisible: false,
                cropperFile: null
            }
        },
        watch:{
            modelValue(val){
                this.value = val
                this.newFile(val)
            },
            value(val){
                this.$emit('update:modelValue', val)
            }
        },
        mounted() {
            this.value = this.modelValue
            this.newFile(this.modelValue)
        },
        methods: {
            newFile(url){
                if(url){
                    this.file = {
                        status: "success",
                        url: url
                    }
                }else{
                    this.file = null
                }
            },
            cropperSave(){
                this.$refs.cropper.getCropFile(file => {

                    file.uid = this.cropperFile.uid
                    this.cropperFile.raw = file

                    this.file = this.cropperFile
                    this.file.tempFile = URL.createObjectURL(this.file.raw)
                    this.$refs.uploader.submit()

                }, this.cropperFile.name, this.cropperFile.type)
                this.cropperDialogVisible = false
            },
            cropperClosed(){
                URL.revokeObjectURL(this.cropperFile.tempCropperFile)
                delete this.cropperFile.tempCropperFile
            },
            handleRemove(){
                this.clearFiles()
            },
            clearFiles(){
                URL.revokeObjectURL(this.file.tempFile)
                this.value = ""
                this.file = null
                this.$nextTick(()=>{
                    this.$refs.uploader.clearFiles()
                })
            },
            change(file,files){
                if(files.length > 1){
                    files.splice(0, 1)
                }
                if(this.cropper && file.status=='ready'){
                    const acceptIncludes = ["image/gif", "image/jpeg", "image/png"].includes(file.raw.type)
                    if(!acceptIncludes){
                        this.$notify.warning({
                            title: '上传文件警告',
                            message: '选择的文件非图像类文件'
                        })
                        return false
                    }
                    this.cropperFile = file
                    this.cropperFile.tempCropperFile = URL.createObjectURL(file.raw)
                    this.cropperDialogVisible = true
                    return false
                }
                this.file = file
                if(file.status=='ready'){
                    file.tempFile = URL.createObjectURL(file.raw)
                }
            },
            before(file){
                const acceptIncludes = this.accept.replace(/\s/g,"").split(",").includes(file.type)
                if(!acceptIncludes){
                    this.$notify.warning({
                        title: '上传文件警告',
                        message: '选择的文件非图像类文件'
                    })
                    this.clearFiles()
                    return false
                }
                const maxSize = file.size / 1024 / 1024 < this.maxSize;
                if (!maxSize) {
                    this.$message.warning(`上传文件大小不能超过 ${this.maxSize}MB!`);
                    this.clearFiles()
                    return false
                }
            },
            handleExceed(files){
                const file = files[0]
                file.uid = genFileId()
                this.$refs.uploader.handleStart(file)
            },
            success(res, file){
                //释放内存删除blob
                URL.revokeObjectURL(file.tempFile)
                delete file.tempFile
                var os = this.onSuccess(res, file)
                if(os!=undefined && os==false){
                    this.$nextTick(() => {
                        this.file = null
                        this.value = ""
                    })
                    return false
                }
                var response = config.parseData(res)
                file.url = response.src
                this.value = file.url
            },
            error(err){
                this.$nextTick(()=>{
                    this.clearFiles()
                })
                this.$notify.error({
                    title: '上传文件未成功',
                    message: err
                })
            },
            generateRandomString(length) {
                let result = '';
                const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
                const charactersLength = characters.length;
                for (let i = 0; i < length; i++) {
                    result += characters.charAt(Math.floor(Math.random() * charactersLength));
                }
                return result;
            },
            request(param){
                var apiObj = config.apiObj;
                if(this.apiObj){
                    apiObj = this.apiObj;
                }
                this.$API.system.upload.token.get().then(oss=>{
                    var rand = this.generateRandomString(16);
                    var cfg = {
                        key : `${oss.data.dir}${rand}_${param.file.name}`,
                        policy: oss.data.policy,
                        OSSAccessKeyId: oss.data.accessid,
                        success_action_status : '200', 
                        callback: oss.data.callback,
                        signature: oss.data.signature,
                    }
                    apiObj.url = oss.data.host;
                    param.data = cfg;
                    const data = new FormData();
                    for (const key in param.data) {
                        data.append(key, param.data[key]);
                    }
                    data.append(param.filename, param.file);
                    apiObj.post(data, {
                        onUploadProgress: e => {
                            const complete = parseInt(((e.loaded / e.total) * 100) | 0, 10)
                            param.onProgress({percent: complete})
                        }
                    }).then(res => {
                        var response = config.parseData(res);
                        if(response.code == config.successCode){
                            param.onSuccess(res)
                        }else{
                            param.onError(response.msg || "未知错误")
                        }
                    }).catch(err => {
                        param.onError(err)
                    })
                });
            }
        }
    }
</script>

<style scoped>
    .el-form-item.is-error .sc-upload .el-upload--picture-card {border-color: var(--el-color-danger);}
    .sc-upload .el-upload--picture-card {border-radius: 0;}

    .sc-upload .uploader,.sc-upload:deep(.el-upload) {width: 100%;height: 100%;}

    .sc-upload__img {width: 100%;height: 100%;position: relative;}
    .sc-upload__img .image {width: 100%;height: 100%;}
    .sc-upload__img-actions {position: absolute;top:0;right: 0;display: none;}
    .sc-upload__img-actions span {display: flex;justify-content: center;align-items: center;width: 25px;height:25px;cursor: pointer;color: #fff;}
    .sc-upload__img-actions span i {font-size: 12px;}
    .sc-upload__img-actions .del {background: #F56C6C;}
    .sc-upload__img:hover .sc-upload__img-actions {display: block;}
    .sc-upload__img-slot {display: flex;justify-content: center;align-items: center;width: 100%;height: 100%;font-size: 12px;background-color: var(--el-fill-color-lighter);}

    .sc-upload__uploading {width: 100%;height: 100%;position: relative;}
    .sc-upload__progress {position: absolute;width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;background-color: var(--el-overlay-color-lighter);z-index: 1;padding:10px;}
    .sc-upload__progress .el-progress {width: 100%;}
    .sc-upload__uploading .image {width: 100%;height: 100%;}

    .sc-upload .file-empty {width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;flex-direction: column;}
    .sc-upload .file-empty i {font-size: 28px;}
    .sc-upload .file-empty h4 {font-size: 12px;font-weight: normal;color: #8c939d;margin-top: 8px;}

    .sc-upload.sc-upload-round {border-radius: 50%;overflow: hidden;}
    .sc-upload.sc-upload-round .el-upload--picture-card {border-radius: 50%;}
    .sc-upload.sc-upload-round .sc-upload__img-actions {top: auto;left: 0;right: 0;bottom: 0;}
    .sc-upload.sc-upload-round .sc-upload__img-actions span {width: 100%;}
</style>
